Means for regulating rotary pumps and rotary engines.



G. SILVESTRI.

MEANS FOR REGULATING ROTARY PUMPS AND ROTARY ENGINES. APPLICATION FILEDJUNE 16. 1913.

LMLIR. Patented May 25,1915.

2 SHEETS-SHEET l.

I fff/ MA fwn/126g.

THE NURRIS PETERS Co PHOTO LITHO.. WASHINGTON, D. c

G. SILVESTRI. MEANS PQR REGULATING ROTARY PUMPS AND ROTARY ENGlNES.

APPLICATION FILED JUNE 15| 1913. l 9 4 l 9@ l o Patented 25, 1915.

2 SH SHEET 2.

TDITED STATES PATENT @ITICQ GIULIO SILVESTRI, OF VIENNA,AUSTRIA-HUNGARY.

MEANS FOR. REGULATING- ROTARY PUMPS AND ROTARY ENGINES.

marcia Application led June 16, 1913.

T0 all zo/rom it may concern Be it known that I, GIULIO SILVESTRI, acitizen of Austria, and resident of Vienna, Lower Austria, and Empire ofAustria- Hungary, have invented certain new and useful Improvements inMeans for Regulating Rotary Pumps and Rotary Engines, of which thefollowing is a specification.

The invention relates to an installation which permits variation at anydesired in stant and at will, of the quantity of fluid to be deliveredby a rotary pump operated at a constant number of revolutions between amaximum determined by the volume of the pump and zero, as is illustratedand described in my copendng application Serial No. 774001.

The invention also permits variations at any desired instant of thenumber of revolutions of a fluid-driven engine receiving its operatingliuid from a pump delivering a constant quantity of liuid between theminimum determined by the ratio of volume between pump and engine and atheoretical unlimited maximum, as is illustrated in my copendingapplication Serial No. 774002.

An installation according to the invention includes a rotary distributeror How inter rupter, an automatic valve which, at a certain position ofthe flow interruptor, causes the liquid to flow in a certain direction,and an accumulator, said parts being connected with the pump or with theengine or with both, and the liow interrupter of which is driven at arate proportionate to that of the pump or the engine.

The object of the invention is an embodiment of an interrupter which maybe used in installations for regulating the output of a pump and alsofor varying the number of revolutions of a rotary motor.

rIhe flow interruptor forming the object of the invention and in whichall of the movable and adjustable parts are completely balanced is shownin Figure l in section on line XVI-XVI of Fig. 2 and in Fig. 2 insection on line XVII-XVII of Fig. l, while Figs. 3 and el illustrate inelevation and in section the one half of the sleeve sur rounding thedistributer.

The casing of the interruptor is in two Specification of Letters Patent.

Patented May 25, 1915.

Serial No. 774,003.

parts a, of. symmetrical form connected to each other in any suitablemanner.

As shown, in the interior of each part a of the casing are formed apassage and a chamber 0,' each passage communicates with the connectingbranch Z and each chamber c with the connecting branch c, the saidbranches CZ and c serving according to the direction of rotation, asinlet and outlet for the fluid being delivered. The passages bcommunicate at several points by means of ports t' with the interior ofthe casing a while the chambers 0 are directly connected with thereduced end of the cavity formed in the casing.

In the casing is mounted the rotary distributer proper indicated at f,which is of hollow double conical form and is continuously rotated at aspeed proportional to the number of revolutions of the machine or enginecontrolled thereby; the said distributer being mounted on or forming onepiece with a shaft g which is led through the stufling boxes it to theexterior of the casing and carries at the outer end the actuating means(not shown).

In the distributer are arranged ports 7c, which, on rotation of thedistributer, register with and pass out of register with the ports c'.The ends of the distributer adjacent the chambers c are open so that theinterior of the distributer is continuously in communication with thechamber c. The distribution of the fluid is therefore always effectivewhen the ports Ze and z' are in register.

Between the distributer f and the casing a is fitted a double conedsleeve formed with corresponding ports the size of which de termines theduration of the period during which there is a free passage through theports and z'. As this duration is to be variable, and accordingly, thelength of the ports (considered in the direction of the circumference)must be adjustable, the sleeve is formed of two parts a and 0 each partbeing formed with projections r and s directed toward one another andengaging each other after the manner of teeth in such manner that in thetwo extreme positions of the parts in which the pairs of adjacent l thetwo parts of the edges of the projections are close together,

the sleeve has as many ports (l as there are ports i in the outer casinga., while in every intermediate position of the two parts double thenumber of ports q and g1 is formed in the sleeve, one half ofthe number(Q1) being covered by solid portions of the Vwall of the outer casing ofthe pump and being therefore ineffective.

The parts (n) of the sleeve are adjusted and secured immovably withinthe casing a. The location of one edge of each of the proj ections 1 ofthe part n determines the time of opening of the outlet for the fluid.vThe middle part 0 ofthe sleeve is adapted to be turned and can bemanually adjusted by a lever t.

The width of the projections r and s on sleeve is such that when theprojections are close together, openings g are formed whichy are of suchlength (considered in the direction of rotation) relatively to the ports7c in the distributer, that on rotation of the distributer there is nointerrupt-ion of the flow of the lluid. This result can only beobtained, however, if the number of the ports 7c on the distributerbody, as illustrated, is correspondingly greater than the number ofports in the casing, so that one port la comes into register with theports g in the sleeve before the preceding` port if: leaves the sameport g in the sleeve.

The formation of the distributer f and the sleeve fri-0 as symmetricaldouble cones insures complete balance of these two parts in the axialdirection. In addition, the symmetrical formation permits thearrangement of the device for balancing the mov'- able part o` of thesleeve in circumferential direction within the apparatus itself. Thisbalancing of the part 0 of the sleeve in the circumferential directionis eected as follows:

In the sleeve 0 are arranged additional ports 'to2 the size of thepressure surfaces of which is chosen with regard to the size of thepressure surfaces of the ports Q of the sleeve in such manner, that Vtheturning moment with'regard to the central axis of the distributer bodyis equal; the length of these openings cu2 is about equal to thegreatest length of the inlet ports g.

The ports 'L02 are engaged by a fixed mem- 'ber m2 located in a slot inthe sleeve o and the length of which member is equal to the length ofthe plain portions s kof the adjustable part 0, the length beingconsidered in the direction of the circumference. On displacement of thepart 0 of the sleeve the ports L02 the number of which is equal to thenumber of ports g are divided together with the ports g into twochambers w2- and fw* by means of the member m2 of which chambers thosewhich have the same angular displacement as the ports for the drivingmedium, are also under the same pressure as the latter. This is obtainedeasiest by connecting together the chambers having the same angulardisplacement; since in these chambers the pressure acts in oppositedirections and since the turning moments are equal, the part o of thesleeve is completely balanced and therefore can be displaced without agreat amount of force.

The distributer f consists preferably of two parts connected by a sleevef, and chambers c, are arranged at the sides of the distributer f. Thelevers t connected to form one' piece are led to the exterior through aport u in the casing a.

. A flow interrupter of such construction can be used both for pumps andengines, and in this latter case one of the branches intended for theoutlet of the fluid may be used for the connection for the delivery partof the pressure pipe, while the other may be used for connection withthe accumulator. The apparatus operates inboth directions of rotationits parts being completely balanced.

Itis evident that the distributer f in place v of being rotated may havea reciprocating movement (oscillating movement). To obl tain the sameeffect, this movement however, must extend through an angle of ycor,-responding size.

Having described my invention I declare that what l claim and desire tosecure by Letters Patent of the United States is :e`

1. The hereindescribed flow interrupter consisting of a casing havingfour passages two of which serve as driving medium inlets and two asdriving medium outlets, a rotary double-conical hollow distributerhaving a ported wall adapted during its ro-` tation to establishcommunication at inter-` vals between the driving medium inlets and thedriving medium outlets, and a doublef conical sleeve disposed betweenthe casing and the distributer,y said sleeve consisting of twostationary parts and of an adjustable part intermediate said stationaryparts, said parts having interengaging tooth shaped projections andrecesses and serving to determine by the length of some of theserecesses the duration of the passage of the driving medium through thedistributer.

2. The hereindescribed flow interrupter consisting of a casing havingfour passages two of which serve as driving medium inlets and two asdriving medium outlets, a rotary double conical hollow distributerhaving a ported wall adapted tduring its rotations to establishcommunication at intervals between the driving medium inlets and I andthe distributer, said sleeve consisting of Signed at Vienna' LowerAustria, Aus- 10 two stationary parts and an adjustable part ta-Hungary,this third day of June, A. D. intermediate said stationary parts, said1918.

parts having interengaging tooth shaped projections and recesses, saidadjustable GIULIO SILVESTRI. part being provided With additionalopenings, said openings being engaged by mern- Witnesses:

bers fixed Within the casing, substantially WILHELM BERGER,

as and for the purpose set forth. AUGUST FUGGER.

Copies of this patent may be obtained for live cents each, by addressingthe Commissioner ot Patents, Washington, D. C.

